18697872 has 20 divisors (see below), whose sum is σ = 48302960. Its totient is φ = 6232608.

The previous prime is 18697849. The next prime is 18697901. The reversal of 18697872 is 27879681.

It is a super-2 number, since 2×18697872² = 699220834656768, which contains 22 as substring.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 389539 = 18697872 / (1 + 8 + 6 + 9 + 7 + 8 + 7 + 2).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194722 + ... + 194817.

It is an arithmetic number, because the mean of its divisors is an integer number (2415148).

Almost surely, 2^18697872 is an apocalyptic number.

18697872 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18697872 is an abundant number, since it is smaller than the sum of its proper divisors (29605088).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18697872 is a wasteful number, since it uses less digits than its factorization.

18697872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 389550 (or 389544 counting only the distinct ones).

The product of its digits is 338688, while the sum is 48.

The square root of 18697872 is about 4324.1036065293. The cubic root of 18697872 is about 265.4182170499.

The spelling of 18697872 in words is "eighteen million, six hundred ninety-seven thousand, eight hundred seventy-two".